Why Mental Pictures Can Sway Your Moral Judgment

When we think about morality, many of us think about religion or what our parents taught us when we were young. Those influences are powerful, but many scientists now think of the brain as a more basic source for our moral instincts.

The tools scientists use to study how the brain makes moral decisions are often stories, said Joshua Greene, a Harvard psychologist,citing one well-known example: “A trolley is headed toward five people, and the only way you can save them is to hit a switch that will turn the trolley away from the five and onto a side track, but if you turn it onto the side track, it will run over one person.”

It’s a moral dilemma. Greene and other researchers have presented this dilemma to research volunteers.